Scattering phase function of very large particles in the ocean

Weilin Hou; Kendall L. Carder; David K. Costello

doi:10.1117/12.266505

6 February 1997 Scattering phase function of very large particles in the ocean

Weilin Hou, Kendall L. Carder, David K. Costello

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266505
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Scattering properties of large particles are mostly unknown, either in theory or measurement, primarily due to the significant variations of large particle characteristics in the natural environment and the inability to sample non- invasively. The Marine-Aggregated, Profiling and Enumerating Rover, measures scattering angles in the vicinity of 50, 90 and 130 degrees caused by very large particles ranging from 280 micrometers and up. Measurements were made during SIGMA cruise, April 13-21, 1994 in East Sound, Washington, using structured light sheet formed by 4 diode lasers of 660nm wavelength. The results fit the analytic phase function used by Beardsley and Zaneveld, and indicate a significant elevation of back-scattering efficiency throughout the water column for all downcasts during our multi-day experiments. Some of this increase in efficiency can be explained by multiple scattering, using Monte Carlo simulation, assuming independent scattering. Measured in-situ particle size distributions, in conjunction with Mie theory, demonstrate that large particles are significant scatterers in the ocean and contribute up to 20 percent of total scattering. These measurements support previous theories that large, marine- snow types of particles enhance back scattering efficiency and, when present, contribute significantly to remote sensing signals.

Citation Download Citation

Weilin Hou, Kendall L. Carder, and David K. Costello "Scattering phase function of very large particles in the ocean", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266505

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